摘要
在金刚石压腔中,通过原位拉曼光谱研究了多硅白云母在常温高压下的稳定性。实验获得了多硅白云母从常压到20GPa的拉曼光谱数据,研究了多硅白云母的266、708和3618cm-1谱峰与压力的相关性。研究发现,多硅白云母的708cm-1谱峰随压力增加有规律地向高频方向偏移,与压力的增加呈明显的正相关性,即y(拉曼位移,cm-1)=0.5238x(压力,GPa)+712.31,相关系数R2=0.9656,并且该谱峰在压力4.7GPa时消失,这可能与多硅白云母中的Si、Al替代有关。羟基3618cm-1谱峰则随压力增加向低频方向移动,谱峰的降低与压力的增加呈明显的线性关系变化(y=-0.3402x+3617.8,R2=0.9662),并且强度随着压力的增加也在逐渐减弱,在压力达18GPa时开始消失,推测该压力可能为多硅白云母在常温下脱羟基的极限压力。
Within the diamond anvil cell, the Raman spectroscopic study of phengite was developed at room temperature and under various pressures from 1 atmp to 20 GPa. The authors analyzed the correlation of the modes 266, 708 and 3 618 cm^-1 with the variation of pressure. The mode of 708 cm^-1 increases linearly with the increase of pressure, i.e. , y (Raman shift, cm^- 1 ) = 0. 523 8x (pressure, GPa) + 712.31, and R^2(correlation coefficient) = 0. 965 6, and the mode disappears at 4.7 GPa as a result of substituting Si for Al. The mode of OH^- band and the intensity decrease linearly with the increase of pressure, i.e. , y = - 0. 340 2 x + 3 617.8 and R^2 = 0. 966 2, and the mode disappears at 18 GPa, which is assumed to be the maximum pressure for the dehydration of phengite at room temperature.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2006年第1期71-76,共6页
Acta Petrologica et Mineralogica
基金
国家自然科学基金资助项目(40325005
40228003)
'国家973项目"中国西部大陆深俯冲作用的研究"课题资助(G1999075508)
关键词
多硅白云母
高压
拉曼光谱
相变
phengite
high pressure
Raman spectroscopy
phase transition